[MM3-users] LTMP to Postfix problem

On one of my mailman 3 servers, I am having a problem with Postfix failing to deliver email to Mailman. I keep seeing this in the mail.log:

status=deferred (connect to 127.0.0.1[127.0.0.1]:8024: Connection refused)

What is causing this and how can I fix it?

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